FDA: Dietary supplement dangerous

(CNN) -- Dietary supplements are commonly used to lose weight and build muscle, but the Food and Drug Administration has issued a warning regarding exposure to a potentially harmful ingredient.

The FDA said in the advisory last week that it is using "all available tools at its disposal" to eliminate supplements containing the stimulant dimethylamylamine, or DMAA, from the market. The agency says DMAA, found in supplements including OxyElite Pro and Jack3d, can cause increased blood pressur...